Implement realm object and support realms for built-ins and JS functions (#4354)

- Type for realm objects is introduced (ecma_global_object_t)
- Realm reference is added to built-in objects and ECMAScript functions
- Resolving built-ins, global environments, and scopes require realm object
- Unnecessary global object accesses are removed from the code

Missing: external functions and static snapshot functions have no realm reference

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com

jerry-core/ecma/base/ecma-init-finalize.c

@@ -77,9 +77,9 @@ ecma_finalize (void)
 
   ecma_finalize_global_environment ();
   uint8_t runs = 0;
+
   do
   {
-    ecma_finalize_builtins ();
     ecma_gc_run ();
     if (++runs >= JERRY_GC_LOOP_LIMIT)
     {
@@ -87,6 +87,7 @@ ecma_finalize (void)
     }
   }
   while (JERRY_CONTEXT (ecma_gc_new_objects) != 0);
+
   ecma_finalize_lit_storage ();
 } /* ecma_finalize */